/**
 * #      剑指 Offer 38
 * 名称   字符串的排列
 * 链接   https://leetcode-cn.com/problems/zi-fu-chuan-de-pai-lie-lcof
 * 题解   [636](https://leetcode-cn.com/problems/zi-fu-chuan-de-pai-lie-lcof/solution)
 * 通过率 56.1%
 * 难道   中等
 */

